HAO
HAO Sole Pressure
Here’s HAO’s take on the Distortion +/250 Preamp circuit. It uses LED clipping and features a Brilliance switch for normal, bright, and warm settings. A TL072 dual opamp is used, but on the original, only one side is used and the other is left unconnected. In this layout, I used the unused opamp for the voltage … Read more
HAO Sole Pressure
It’s been a while but I saw this little one was missing, and as I own the pedal and like it, I think it’s a worthwhile addition. So thought I’d try to get back into the game even if it’s a bit diddy and embarrassing compared to what the other guys are posting :o) Info … Read more
HAO Rust Driver
Here’s another plexi-in-a-box pedal. Fairly simple in comparison to others. I’ve drawn 2 layouts for this one; one stock and one with an adjustable gain mod. The EQ switch is optional, as some who’ve built this circuit say it’s pretty lackluster. The original uses an MC4558CN, but just about any dual op-amp should suffice (try … Read more
HAO Rumble Mod
Request. It’s probably worth considering using 2 independent 500K log pots and separating the boost and drive sides. It seems a little restrictive to have them as a dual pot rather than being able to set their gain individually and of course it may also be preferable to make the toggle a stomp so that … Read more